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Mean Well ERPF-400-24 Switching Power Supply 400W 24V 16.7A

high efficiency up to 91%design against rain splashlow cost and high reliability

SKU ERPF-400-24

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Overview

ERPF-400-24 is the 24V output model of this series: rated current 16.7A, rated power 400.8W, typical efficiency 90%.

ERPF-400 series is a 400W single output enclosed type AC/DC power supply with the active PFC design. It adopts a aluminum case and the interior is semi-potted, protecting the internal electronic components from rain splash and dust. With the complete protection functions, ERPF-400 is suitable for the applications such as outdoor LED channel letters, commercial display, etc.

Features

Universal AC input / Full range (Withstand 300VAC surge input for 5 seconds)
Built-in active PFC function
High efficiency up to 91%
Design against rain splash
Protections: Short circuit / Overload / Over voltage/ Over temperature
Cooling by free air convection
LED indicator for power on
Low cost, high reliability
100% full load burn-in test
3 years warranty

Specifications

ERPF-400-24Specifications from the official datasheet (2025-12-12 edition)

OUTPUT

DC VOLTAGE: 24V
RATED CURRENT: 16.7A
CURRENT RANGE^Note.5: 0 ~ 16.7A
RATED POWER: 400.8W
RIPPLE & NOISE (max.)^Note.2: 150mVp-p
VOLTAGE ADJ. RANGE: 21.6 ~ 26.4V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±0.5%
SETUP, RISE TIME: 2000ms, 100ms/230VAC; 3000ms, 100ms/115VAC at full load
HOLD UP TIME (Typ.): 10ms/230VAC; 10ms/115VAC at full load

INPUT

VOLTAGE RANGE^Note.4: 90 ~ 264VAC 127 ~ 370VDC
FREQUENCY RANGE: 47 ~ 63Hz
POWER FACTOR (Typ.): PF≧0.95/230VAC, PF≧0.98/115VAC
EFFICIENCY (Typ.): 90%
AC CURRENT (Typ.): 2.5A/230VAC 3A/115VAC
INRUSH CURRENT (Typ.): cold start 45A/115VAC, 90A/230VAC
LEAKAGE CURRENT: <1mA / 240VAC

PROTECTION

OVER LOAD: 105 ~ 135% rated output power Protection type : Constant current limiting, recovers automatically after fault condition is removed
SHORT CIRCUIT: Protection type : Constant current limiting, recovers automatically after fault condition is removed
OVER VOLTAGE: 27.6 ~ 32.4V Protection type :Shut down O/P voltage, re-power on to recover
OVER TEMPERATURE: Shut down O/P voltage, recovers automatically after temperature goes down

ENVIRONMENT

WORKING TEMP.: -30 ~ +60℃ (Refer to output load derating curve)
WORKING HUMIDITY: 20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -30 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT: ±0.1%/℃ (0 ~ 35℃ )
VIBRATION: 10 ~ 500Hz, 3G 10min./1cycle, 60min. each along X, Y, Z axes

SAFETY & EMC (Note.6)

SAFETY STANDARDS: UL60950-1,IEC/BS EN/EN62368-1, GB 4943.1, EAC TP TC 004, IS13252(Part1)(for 12,24 only) approved
WITHSTAND VOLTAGE: I/P-O/P:3KVAC I/P-FG:2KVAC O/P-FG:0.5KVAC
ISOLATION RESISTANCE: I/P-O/P, I/P-FG, O/P-FG:100M Ohms/500VDC / 25℃/ 70% RH
EMC EMISSION: Compliance to BS EN/EN55032 (CISPR32) class A, GB17625.1,GB/T 9254.1; BS EN/EN61000-3-2; BS EN/EN61000-3-3, EAC TP TC 020
EMC IMMUNITY: Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11, BS EN/EN55035; light industry level, EAC TP TC 020

OTHERS

MTBF: 1981.2K hrs min. Telcordia SR-332 (Bellcore) 233.4Khrs min. MIL-HDBK-217F (25℃)
DIMENSION: 220.4*130*48mm (L*W*H)
PACKING: 1.1Kg; 9pcs / 11Kg / 0.63CUFT

Test conditions and notes6

1. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor.
3. Tolerance : includes set up tolerance, line regulation and load regulation.
4. Derating may be needed under low input voltages. Please check the static characteristics for more details.
5. Please refer to “Static Characteristics".
6. The power supply is considered a component which will be installed into a final equipment. All the EMC tests are been executed by mounting the unit on a 450mm*450mm metal plate with 1mm of thickness. The final equipment must be re-confirmed that it still meets EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf)

Technical drawings

ERPF-400-24 Mechanical Specification — Mechanical Specification

ERPF-400-24 Block Diagram — Block Diagram

ERPF-400-24 Derating Curve — Derating Curve

Typical applications

LED decoration/signage
LED channel letters
LED display

Downloads

Catalogues2

Mean Well Catalog (Industrial) PDF Download

Mean Well Inverter Catalog PDF Download

FAQ

What is the output rating of the Mean Well ERPF-400-24?

The ERPF-400-24 is a 24V enclosed switching power supply rated at 400.8W. Its rated output current is 16.7A, which makes it suitable for higher-load 24V DC equipment that needs substantial continuous power.

What kinds of applications is the ERPF-400-24 commonly used for?

This model is commonly considered for 24V DC applications that need a higher-power enclosed supply, especially in security and general power supply environments. Based on its product classification and 24V 16.7A output, it fits buyers looking for a robust enclosed PSU for commercial or industrial-type systems rather than light-duty loads.

Is the Mean Well ERPF-400-24 designed for demanding temperature conditions?

Yes. The specified operating temperature range is -30°C to +60°C, subject to the output load derating curve. That makes it a practical option for buyers who need a power supply that can handle both low and elevated ambient temperatures within the stated limits.

Does the ERPF-400-24 include built-in protection features?

Yes. The ERPF-400-24 includes short circuit, overload, over voltage, and over temperature protection. Mean Well also specifies automatic recovery after fault removal for short circuit and overload conditions, while over voltage protection requires re-powering to recover.

How efficient is the ERPF-400-24 power supply?

Mean Well rates the ERPF-400-24 at a typical efficiency of 90%. It also includes a PFC circuit with a typical power factor of ≥0.95 at 230VAC, which is useful for buyers comparing higher-power AC-DC supplies for better overall electrical performance.

What approvals and physical size does the ERPF-400-24 have?

The ERPF-400-24 is listed with approvals including UL60950-1, IEC/BS EN/EN62368-1, GB 4943.1, EAC TP TC 004, and IS13252(Part1) for 12V and 24V versions. Its dimensions are 220.4 x 130 x 48 mm, which helps when checking fit in an enclosure or equipment cabinet.

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Model	Power	Voltage	Current
Mean Well ERPF-400-48 Switching Power Supply 400W 48V 8.3A	398.4W	48V	8.3A	View
Mean Well ERPF-400-12 Switching Power Supply 400W 12V 30A	360W	12V	30A	View

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